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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 1,300	$ 887	$ 2,725	$ 2,053
% of total class of receivables	0.41%	0.28%	0.85%	0.65%
Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 242	$ 242	$ 594	$ 513
Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	731	291	1,229	753
Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	9	8	34	17
Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				15
Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	264	281	588	540
Other
Financing Receivable, Past Due [Line Items]
Total loans modified	54	65	280	215
Credit Card:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 238	$ 249	$ 593	$ 523
% of total class of receivables	0.15%	0.17%	0.38%	0.36%
Credit Card: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 233	$ 242	$ 585	$ 513
Credit Card: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Credit Card: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Credit Card: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	5	7	8	10
Credit Card: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Credit Card: | Domestic Card
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 178	$ 207	$ 480	$ 447
% of total class of receivables	0.12%	0.15%	0.32%	0.32%
Credit Card: | Domestic Card | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 173	$ 200	$ 472	$ 437
Weighted-average interest rate reduction	20.49%	19.40%	20.19%	19.19%
Credit Card: | Domestic Card | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Payment delay duration (in months)	12 months	12 months	12 months	12 months
Credit Card: | Domestic Card | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Principal balance reduction	0	0	0	0
Credit Card: | Domestic Card | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Credit Card: | Domestic Card | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	5	7	8	10
Credit Card: | Domestic Card | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Credit Card: | International card businesses
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 60	$ 42	$ 113	$ 76
% of total class of receivables	0.83%	0.65%	1.56%	1.17%
Credit Card: | International card businesses | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 60	$ 42	$ 113	$ 76
Weighted-average interest rate reduction	27.01%	27.41%	26.76%	27.08%
Credit Card: | International card businesses | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Principal balance reduction	0	0	0	0
Credit Card: | International card businesses | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Principal balance reduction	0	0	0	0
Credit Card: | International card businesses | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Credit Card: | International card businesses | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Credit Card: | International card businesses | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Consumer Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 282	$ 281	$ 617	$ 610
% of total class of receivables	0.37%	0.36%	0.80%	0.79%
Consumer Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Consumer Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	13	16	21	79
Consumer Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	9	8	19	17
Consumer Banking: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	258	248	573	504
Consumer Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	2	9	4	10
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 279	$ 272	$ 612	$ 600
% of total class of receivables	0.37%	0.36%	0.81%	0.79%
Consumer Banking: | Auto | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Weighted-average interest rate reduction	8.83%	8.67%	8.78%	8.74%
Consumer Banking: | Auto | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 10	$ 14	$ 17	$ 76
Payment delay duration (in months)	6 months	6 months	6 months	6 months
Consumer Banking: | Auto | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 9	$ 8	$ 19	$ 17
Principal balance reduction	0	0	0	1
Consumer Banking: | Auto | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Consumer Banking: | Auto | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	258	248	573	504
Consumer Banking: | Auto | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	2	2	3	3
Consumer Banking: | Retail banking
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 3	$ 9	$ 5	$ 10
% of total class of receivables	0.22%	0.62%	0.42%	0.75%
Consumer Banking: | Retail banking | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Weighted-average interest rate reduction	0.00%	0.00%	3.48%	2.00%
Consumer Banking: | Retail banking | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 3	$ 2	$ 4	$ 3
Payment delay duration (in months)	25 months	8 months	4 months	13 months
Consumer Banking: | Retail banking | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Principal balance reduction	0	0	0	0
Consumer Banking: | Retail banking | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Consumer Banking: | Retail banking | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Consumer Banking: | Retail banking | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	7	1	7
Commercial Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 780	$ 357	$ 1,515	$ 920
% of total class of receivables	0.90%	0.39%	1.74%	1.01%
Commercial Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 9	$ 0	$ 9	$ 0
Commercial Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	718	275	1,208	674
Commercial Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	15	0
Commercial Banking: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				15
Commercial Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	1	26	7	26
Commercial Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	52	56	276	205
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 307	$ 128	$ 672	$ 381
% of total class of receivables	0.96%	0.36%	2.09%	1.07%
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Weighted-average interest rate reduction	0.00%	0.00%	0.79%	0.00%
Commercial Banking: | Commercial and multifamily real estate | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 286	$ 128	$ 513	$ 327
Payment delay duration (in months)	18 months	11 months	11 months	15 months
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 0	$ 0
Principal balance reduction	0	0	0	20
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				0
Commercial Banking: | Commercial and multifamily real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0	0	0
Commercial Banking: | Commercial and multifamily real estate | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	21	0	159	54
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 473	$ 229	$ 843	$ 539
% of total class of receivables	0.87%	0.41%	1.54%	0.97%
Commercial Banking: | Commercial and industrial | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 9	$ 0	$ 9	$ 0
Weighted-average interest rate reduction	2.14%	0.25%	1.90%	0.25%
Commercial Banking: | Commercial and industrial | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 432	$ 147	$ 695	$ 347
Payment delay duration (in months)	18 months	17 months	16 months	9 months
Commercial Banking: | Commercial and industrial | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0	$ 15	$ 0
Principal balance reduction	0	0	15	3
Commercial Banking: | Commercial and industrial | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified				15
Commercial Banking: | Commercial and industrial | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	1	26	7	26
Commercial Banking: | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 31	$ 56	$ 117	$ 151

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